Deep, irregular cracks resembling dried mud in your paintwork is called mud cracking.
Mud cracking can occur when:
- Paint is applied too thickly, usually over a porous surface
- Paint is applied too thickly, to improve inherent poor hiding (coverage) of lower quality paint
- Paint build up in corners during application
Remove the cracked paintwork by scraping and sanding. Prime and repaint the surface with a premium water-based paint like Dulux Wash&Wear®, and use the correct roller sleeve (5mm nap for gloss & semi gloss and 12mm nap for low sheen and flat finish).
Sanding the surface smooth before repainting with a premium water-based paint can also repair mud-cracked areas. Premium quality paints have a higher solids content, which reduces the tendency to mud crack. They also have very good application and hiding properties, which minimise the tendency to apply the paint too thickly.
More problem solving advice
Have you noticed small droplets appearing on your fresh coat of acrylic paint? This is known as 'surfactant leaching'. Don't panic - it's a normal part of the curing process. For each problem you’ll find a guide to identifying it, its causes and solutions.
Yellowing is the development of a yellow cast in aging solvent-based enamels. It’s most noticeable in the dried films of white paints or clear varnishes. For each problem you’ll find a guide to identifying it, its causes and solutions.